Safety first: Unplug the wine cooler before accessing the compressor or control board.

1. Improve ventilation: Ensure the unit has proper clearance and is not installed in a confined cabinet without ventilation. High ambient temperatures can cause high compressor load.
2. Clean condenser: Remove dust and debris from the condenser coils and verify the condenser fan is operating correctly.
3. Listen for compressor noise: A loud, humming, or clicking compressor may indicate mechanical failure. If the compressor is extremely hot to the touch (use caution), it may be overloading.
4. Inspect main PCB current sensor: Some boards use a current-sensing device or shunt resistor. If visibly burnt or cracked, the board should be replaced.
5. Technician diagnosis: Measuring compressor current draw and checking for sealed system restrictions requires specialized tools. Contact a professional if C1 persists after basic airflow and cleaning checks.

Warning: Do not attempt to open or repair the sealed refrigeration system yourself.

Display shows C1 and the compressor may run continuously or not at all.

Possible Causes